TypeError: cannot pickle when attempting to copy.deepcopy an object with a Cookies object

[mborsetti]

This should be self-explanatory:

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun  6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import copy
>>> from httpx import Cookies
>>> my_data = {'cookies': Cookies({'a': 'b'})}
>>> my_data_copy = copy.deepcopy(my_data)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 136, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 221, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 162, in deepcopy
    y = _reconstruct(x, memo, *rv)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 259, in _reconstruct
    state = deepcopy(state, memo)
            ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 136, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 221, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 162, in deepcopy
    y = _reconstruct(x, memo, *rv)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 259, in _reconstruct
    state = deepcopy(state, memo)
            ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 136, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 221, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python\Python312\Lib\copy.py", line 151, in deepcopy
    rv = reductor(4)
         ^^^^^^^^^^^
TypeError: cannot pickle '_thread.RLock' object
>>>

Deepcopying an object containing request's CaseInsensitiveDict (which holds cookies) or httpx Headers does not throw an Exception.